Unable to set type_body_length function_body_length file_length only as warnings with no error.

[uevs]

New Issue Checklist

• I've Updated SwiftLint to the latest version.
• I've searched for existing GitHub issues.

Bug Description

I'm trying to set type_body_length function_body_length file_length to be warning only with custom length. I want to have a warning if the length reaches a certain limit, but no errors.

This is not clearly documented, but should be available #1647 #1691

I'm testing this by running:

swiftlint --quiet | grep -E 'error.*(type_body_length|function_body_length|file_length)'

And I would expect no errors in the output, but I do get errors using the default error limit of the respective rule.

I tried the following variations:

type_body_length: 400

type_body_length:
  warning: 400

type_body_length:
  - 400

type_body_length:
  warning: 400
  error: null

type_body_length:
  warning: 400
  error: nil

type_body_length:
  warning: 400
  error: ~

but none is working. It either gets the defults value of the rule:

error: Type Body Length Violation: Type body should span 500 lines or less excluding comments and whitespace: currently spans 528 lines (type_body_length)

or gives me:

warning: Invalid configuration for 'type_body_length' rule. Falling back to default.

Environment

• SwiftLint version: 0.57.0
• Xcode version: 16.0
• Installation method used: Homebrew
• Configuration file:

only_rules:
  - superfluous_disable_command
  - type_body_length
  - function_body_length
  - line_length
  - file_length
  # auto-correctable rules:
  - leading_whitespace
  - trailing_whitespace
  - trailing_comma
  - trailing_newline
  - colon
  - trailing_semicolon
  - opening_brace
  - closing_brace
  - return_arrow_whitespace
  - comma
  - empty_enum_arguments
  - empty_parameters
  - void_return

excluded:
  - fastlane/.tempbuild
  - Package/**/*/PreviewAssets.swift
  - Package/.build
type_body_length: 400
function_body_length: 91
file_length: 610
line_length:
  warning: 400
  error: 500

[SimplyDanny]

Can you provide a small reproducer? For me, this works. The configurations

type_body_length:
  warning: 40

type_body_length:
  warning: 40
  error: 50

type_body_length: 40

type_body_length: [40, 50]

work as I'd expect.